Piecewise hashing

Please help to improve this article by expanding it.
Further information might be found on the discussion page.

Piecewise hashing is a hashing technique to divide an input into chunks and hash each chunk separately. It was invented by Nick Harbour in dcfldd to improve the reliability of disk imaging. The theory was that if one chunk became corrupted, only the integrity of that chunk would be threatened. The piecewise hashes of the other chunks, which hadn't changed, could be used to prove their integrity.